package v1.chapter10.font;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;

import javax.swing.JComponent;
import javax.swing.JFrame;

public class FontTest {

	public static void main(String[] args) {
		EventQueue.invokeLater(()->{
			JFrame frame =new FontFrame();
			frame.setTitle("FontTest");
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
			frame.setVisible(true);
		});

	}

}

class FontFrame extends JFrame{
	public FontFrame() {
		add(new FontComponent());
		pack();
	}
}

class FontComponent extends JComponent {
	private static final int DEFAULT_WIDTH = 300;
	private static final int DEFAULT_HEIGHT = 200;
	
	public void paintComponent(Graphics g) {
		Graphics2D g2=(Graphics2D)g;
		
		String message="Hello,World!";
		Font f=new Font("Serif",Font.BOLD,36);
		g2.setFont(f);
		
		FontRenderContext context=g2.getFontRenderContext();
		Rectangle2D bounds= f.getStringBounds(message, context);
		
		double x = (getWidth() - bounds.getWidth()) / 2;
	    double y = (getHeight() - bounds.getHeight()) / 2;
	    
	    double ascent=-bounds.getY();
	    double baseY = y + ascent;
	    
	    g2.drawString(message, (int)x, (int)baseY);
	    g2.setPaint(Color.RED);
	    
	    g2.draw(new Line2D.Double(x, baseY, x+bounds.getWidth(), baseY));
	    
	    Rectangle2D rect=new Rectangle2D.Double(x,y,bounds.getWidth(),bounds.getHeight());
	    g2.draw(rect);
	}
	
	public Dimension getPreferredSize() {
		return new Dimension(DEFAULT_WIDTH,DEFAULT_HEIGHT);
	}
}